${{\mathit \Xi}}$ BARYONS
($\mathit S$ = $-2$, $\mathit I$ = 1/2)
${{\mathit \Xi}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$, ${{\mathit \Xi}^{-}}$ = ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$ ${\mathit {\mathit s}}$

INSPIRE search

${{\mathit \Xi}{(1620)}}$ $I(J^P)$ = $1/2(?^{?})$ J, P need confirmation.

The clearest evidence is a peak in ${{\mathit \Xi}^{-}}{{\mathit \pi}^{+}}$ seen by SUMIHAMA 2019. Older low-statistics experiments (e.g., BORENSTEIN 1972 and HASSALL 1981) have looked for the state but have not seen any effect.

${{\mathit \Xi}{(1620)}}$ MASS

$\approx1620$ MeV

${{\mathit \Xi}{(1620)}}$ WIDTH

$32 {}^{+8}_{-9}$ MeV (S = 2.2)

${{\boldsymbol \Xi}{(1620)}}$ DECAY MODES

$\Gamma_{1}$

${{\mathit \Xi}}{{\mathit \pi}}$

248